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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
So it is not piezo but something called magnetic buzzer, matches this picture and description https://www.aliexpress.com/item/1649570962.html
EDIT: or this https://www.quartz1.com/price/techdata/VS5030B.pdf